Plate-clamping mechanism for printing presses



Oct. 25, 192'?.

H.- M. BARBER PLATE CLAMPING MECHANISM FOR PRINTING PRESSES Filed Deo.51, 1925 2 Sheets-Sheet 1 INVENTOR M. wm..

INIT

ATTORNEYS i 25 19 Oct 27 H. M. BARBER PLATE CLAMPING MECHANISM FORPRINTING PRESSES Filed Dec. 51, 1925 2 Sheets-$18615 2 ATTORNEYSPatented Oct.v 25, 192'?.

f @ii-rural) sas HOWARD. ivI. BARBER, oE WEsTERLY, RHODE ISLAND,ASSIGNOR 'ro c.A Is'. coT'iRELn a SONS coiiIPiiNY, 0E WESTERLY, RHODEISLAND, A coRPoRATIoN oE DEI. iivvi\.RE.A

PLATE-CLAMPING MEGPIANISM PoR PRINTING PRESSES.

lThe object of my inventionis to provide plate cylinders with novelplate clamping means whereby one or a group of plates may `be lockedv tothe cylinderin one operation, thereby materially facilitating the layingand removal of the plates when the cylinder carries a full complement.

My invention includes means whereby the intermediate sideplate clampsmay beadjusted with respect to the inner and outer plate clamps, saidintermediate plate clamps also having a limited freelongitudinal'movement sothat when a full complement of plates is to belocked to the cylinder, itin-ay be accomplished in one operation throughthe medium of said plates, by moving the outer Side plate clampsinwardly along the cylinder; vAV practical embodiment of my inventionisrepresented in the accompanying A'draw- Vings, in which: Y

Fig. l representsa detail side view Yof a plate cylinder with myimproved plate clamping means applied thereto, a yfull complement of'threef plates being ,shown flocked Vto the cylinder'by'utilizing theinner, outer andintermediate side plate clamps.'

Y Y '5 represents adeta'il Atransverse sec#4 tion takeninthe plane ofthe line V-V of 40 in v.the direction of .thear- A Fig.

Fig. 2 represents a detail longitudinal section taken in the vplane ofthe line II-PII of Fig. 4, Vlookingy in the vdirection ofthe Iarrows. iFig. tion taken in the plane oftheline111-III of Fig. 2,

larrows. g Y

Fig. Y4 represents a ldetail'eniil vi'ewi'of-the@ 1 f'Coactingfdeviceson thewshaft, andycylin- Yder are providedforyieldiiigly holdingthe *cylinder partly Sin section.

Fig. k1, looking rows.v

tion taken in the plane ofthe lineVI-VI of Fig.Y `1, lo,ol;iiigv in thedirectionl of the;

The sliell of the Vplate cylinderis denoted y 1, the middle lor innercircumferential series of fixed side vplate'clamps by 2, the outercircumferential Series of' longitudi-V nally adjustable side plateAclampsby 3,.and the two intermediate circumferential Vseries oflongitudinally adjustable side platel clamps by 4 and 5. Q i Each of theouter side plate clamps 3 is engaged with a screw shaft 6, rotatably V3represents a vdetail transverse's e`c-yy looking in the direction ofthe.y

" f outwardly alollgzgtlle cylinderandtoadjust 6 represents a`detailt1ansverse sec-l `Application led December 31, 1925.'v Serial No.78,578.'

mountedlin the cylinder beai'eii?. lThe threaded .portion of thisscrewshaft 6 pro-v jects into van undercut .groove 8,1.the .side

clamp The two screw shafts 6 of each -walls of 'which form guides forthe' .plate pair of side cla-inps?) around the cylinder are connected tovmove'in unison byrproviding the shafts with pinions 10, meshing withacommongear 11, rotatably mounted', on-fa studaxle 9. A springA pressedpawl 12engages the gear 11 to hold the" two screw Shafts 6, of a pair,in their adjusted position. lEachscrew shaft "6 .is shapedat -it's outerend for the reception of ar Suitable wrench or other tool, not shownherein, foi

turning 'the Said shafts to move the outer side clamps inwardly .oroutwardly along the the same in the desired rotative adjustment.

cylinder, as desired. f A spring pressed pam/l l12 engagesthe gear 11 t6yieldinglyfhold Each ofthe intermediate side plate clamps 4 engages ascrew shaft 13 rotatably mount- `ed and having a limited free-endwisemovement insuitable Vbearings 14 and 15yat-the inner andl outer,endsofthe undercut groove 16, the side walls of jwhich form guidesforthe movement of the side plate clampy 4 Y along the cylinder. Each screwShaft 13l is provided withl an element, in vthe.present instance apinion 17 ,'eXposed through acir` Acu'mferential V'groove18-in thecylinder for manuallengagementfby a suitable tool, such as a rack,tojrotate they piniongand thereby the shaft,to adjust the clamp inwardlyVand the saine for plates of different widths. Y.'

screw shaft against unintentional rotation, Which devices are hereinshown asl ajwide alspring vpressedyielding pin20 engaged therewith.ciently wide tofremain at allgtimeszingenf Thetoothed nwheel'19'fisjsut'ti-V of the free endwise movement ofthe screwl f '95 )facedtoothed wheel19,` fast onthe. shaft andg,

-gagementwiththepin betweenthe limits 1.00

' and described, but

From the above description it will be seen that the clamps 3, 4c and 5may be Aadjusted along the cylinder to any size plate withinpredetermined limits.

The procedure for locking a longitudinal row of three plates 28, 29, 30to the cylinder in one operation is as follows The clamps 3, 4 and 5 areadJusted on their screw shafts so that they will clear the plates whenthe screw shafts 13 and 2l are moved endwise to their outer limits.

Thek plates are then laid in position on the cylinder, the plate 28between the inner fixed clamps 2 and the intermediate clamps 4, theplate 29 between the intermediate clamps 4 and the intermediatewclamps 5and the plate 30 between the intermediate clamps 5 and the outer clamps3. The clamps 3 are then moved inwardly by rotating the shaft or" shafts9 and thereby the screw shafts 6 until tlie plates are securely locked,this being accomplished by' the limited free longitudinal movement ofthe intermediate clamps 4 and 5. v

It will be understood that a single plate 'can be lockedin anyone of thethree positions 0r that two of the plates can be locked in any'of thethree positions by the manipulation of the several clamps. fIt will beseen from the above description that where the cylinder carries a fullcom'- plement of plates the laying and removal of the plates` ismaterially facilitated, as the plates may be locked to or unlocked fromthe cylinder in one operation. y

It is evident that various changes may be resorted to intheconstruction, form and arrangement of the several parts withoutdeparting' from the spirit andv scope of my invention; hence, IV do notwish vto be limited toy the particular embodiment herein kshown WVhat Iclaim is 'A y,1. A cylinderand plate clamping means therefor, includinga double side plate clamp arranged to engagetwo adjacent plates, saidcylinderliavingva' longitudinal groove form- Ving a guide for ltheclamp, and a circumferential groove, end bearings 1n said longitudinalVgroove, a single threaded screw shaft having a limited free endwisemovement in said end bearings and engaging theclamp for impartingendwise movement thereto,

l 'and' meansl on said shaft exposed through said circumferential groovefor use in the manual rotation of said shaft. v

2. A cylinder and plate clamping Vmeans therefor, in cluding a doubleside plate clamp circumferential groove for use in the manual rotationof said shaft, and means for yield` ingly holding the shaft againstunintentional rotation between the limits of its free endwise movement.l I

3. A 'cylinder and plate clamping means therefor, including a doubleside plate clamp arranged to engage two adjacent plates, said cylinderhaving a longitudinal groove forming a guide for the clamp, and acircumferential groove, end bearings in said longitudinal groove, arsingle threaded screw shaft having a limited free endwise movement insaid end bearingsv and engaging the clamp for imparting endwise movementthereto, and a pinion on said shaft exposed through said circumferentialgroove forense in the having a limited free endwise movement in said endbearings and engaging the 'clamp r foriinparting endwise movementthereto, a pinion on said shaft exposed through said circumferentialgroove for use in the manual rotation of the shaft, a wide facedtoothed,wheel fi-'Xed on sai-dshaft, and Va spring pressed yielding pin ,engagedtherewith to yieldingly holdthe screw shaft against unintentionalrotation between thelimits of its free endwise movement.`

In testimony, that I claim the foregoingV as i my invention, 'I havesigned 29th day of December, 1925.

HOWARD M. BARBER.;

my name this

